Answer: 13.6 eV.
- A 3.4 eV
- B 10.2 eV
- C 13.6 eV
- D 27.2 eV
Correct answer: C. 13.6 eV
Explanation: Energy to remove electron from n=1: E = 0 - (-13.6) = 13.6 eV. This is the ionization energy.
In the photoelectric setup, light striking the metal plate ejects electrons that cross the evacuated tube to the collector, producing a measurable current on the ammeter.
Concept context
Photoelectric effect, de Broglie waves, Bohr's model, atomic spectra.